Peters



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Letters Patent No. l05,078,.dated July 5, 1870.

IMPROVEMENT IN STEAM-ENGINES The Schedule referred to in these Letters Patent and making part of the same.

To all 'whom it mcyeoncern:

Be it known that I, J OHN C. Hor-Duur, of Lawrence, in the county of Essex and State of Massachusetts, haveinvented Improvements in the Detailsof Arrangement and Construction of SteamEngines; and I do hereby declare that the following, taken in conuection with the drawing which accompanies and forms part of this specification, is a description of my invention sufiicient to enable those skilled in the art to practice it. Y

The invention to be herein described is designed, in most of its parts, for application to portable en` gines, that is, engines in which all the parts are connected, so that they are all moved as a unit, the boiler servingas the bed for the cylinder and the shaft-bearings, either with or without a bed-plate.

One part of my invention consists in so constructin g and locating the cylinder that the volatile'prod nets of combustion which are carried out of the chimney by the exhaust-blast pipe are made to pass around and in contact with the cylinder, to keep it at or about the temperature ofthe steam.

Another part of my invention consists in locating the feed-water heater in the smoke-box, between the ends'of the boi1er-fiues znd the passage where the volatile products ofcombnstion pass around the cylinder, so that, in heating the feed-water, enough heat shall be abstracted by the feed-water `from the escaping smoke and gases to prevent overheating the cylinder thereby.

Figure l ofthe drawing represents, i vertical longitudinal section, a portable steamengine, embodying my invention.

Figure 2 represents a. front, and

Figure 3, a rear end view of the same.

i Figure 4 shows, in vertical sectional elevation, my peculiar combination of the safety-valve and steamwhistle.

The boiler is of the common multitubular locomotive type, and therefore needs no description.

The cylinder is located over the smoke-box of the boiler, and is so cast that the smoke from thesmoke-v box moves through passages made in the casting around the cylinder to a nozzle,a, on which the chimney is tted.

A regulator of any suitable kind, working any suitable' governor-valve, is located above, and is attached to the steam-drum of the boiler, the regulator-valve spindle passing through a suitable stufling-box.

The regulator-valve and its case b are located near the top of the interior of the steamfdrnm, so as to take into the steampipe c d steam which has the least quantity of water mechanically held therein o'any in the boiler. The steam passes down through` pipe c past the throttle or steam-valve e, (the rod of whichpasses through a suitable stuffing-box to a lever located at the lire-box end of the bollen) into and through pipe ll, to theA ox-horn pipe f in the smoke-box, which pipe f is connected with and discharges into the valvc- 4may be worked as usual from the cross-head,'or by an eccentric on the main shaft.V

The heater g intercepts the.outgoing-current of 'smoke and gases between the fines and the entrance to the passage leading to the chimney around the cylindcr, 'and absorbs considerable of the heat from the escaping volatile products of combustion.

On one side ofthe boiler, and near the furnace end, is a. pipe, 7i, which has two branches, ij, the branch t being connected with the steam-space of the boiler, and the branch 7' entering the boiler below the lowest Water-level.

To this pipe, which is fully in yiew of the fireman and engine-tender when at work in attending the fire,

are att-ached the gauge-cocks k, the glass water-gauge l, and the pressure-indicating gauge lm.

The pressure-gauge is connected by pipe n with the steam in the steam-drum, and by pipe o with the steam in pipe c 1I, by means of a three-way cock at p, so that, by turning said cock, the steam pressure on the boiler can be read uponthe gauge, orthe lessened pressure of steam in pipe c d showing how much the steam is reduced in pressure by throttling through the regnlator-valve.F

' In the upper part of pipe h is a valve-seat, g, on which rests the safety-valve r, which is of the poppct variety, guided by wings fitting the steam-passage to the valve-seat.

The valvelr is deeply concaved from its upper side, and is heldto its seat against steam pressure by a follower, s, which is acted on by spring t, which spring is made more or less tense by adjusting, down or up, the screw-cap u, which cap serves also to support the i whistle-bello, the upper part of the cap being made like the base of an ordinary steam-whistle.

To lift the valve 'r to blow thelwhistle there 4is coupled to follower s a spindle, iv, which can be raised by lever x, which lever cannot be used to hold the safety-valve down upon its seat, as the spindle has a long slot in it, against the upper boundary of. which only is the lever a: operative. f

The lower end of spindle wis screw-threaded, andv connects with nut, y, coupled to the follower s. As the threads on the spindle w have the same pitch with the threads on the screw-cap u, the valve r is not af- -fected when the tension of spring tis adjusted by turning the screw-cap u up or down. l

The follower s is kept from turning, when the rod w is turned in adjustingthe pressure of fthe spring t, by means of ears, z z, sliding freely in vertical channels, a' te', in the sides of the case h.

A pipe, not shown, is extended from the orifice t' up to the interior of the drum, near the top, to conduct dry steam to the whistle through the safety-valve; and a bacr, not shown, is put into the .pipe`h, below the safety-valve, to prevent the passage ol water to the safety-valve and whistle, in blowing olf steam, by excess of pressure, and in blowing the whistle.

I claim- A steam-engine, having itscylinder so constructed and located that thehot volatile products of combussaid pipes, with the steam .in the boiler, 'and with the steam in the pipe between the automatic regulatorvalve and the steam-cylinder, that, with the single gauge, can be tested, atwill, the pressure of the steam inl either space.

. J. G. HOA-DLEY'.

Witnesses:

J. B. CROSBY, C. WARREN BROWN. 

